Resumen
The major point of the paper under discussion (Swanson, 1989) is that the El Jagüey-La Breña complex, located in Durango's Guadiana valley (Figure 1), is a previously unrecognized type of maar volcano, in which a caldera (La Breña) formed following eruption of supporting material through an adjacent maar (El Jagüey). The paper proposed a simple developmental history (Figure 2), consistent with the geology and location of the volcanic complex. The complex started as a scoria cone, like 100 others in the valley; it evolved into a breach scoria cone, as most scoria cones do; then water encroachment briefly and dramatically converted the eruption style from magmatic to phreatomagmatic, creating El Jagüey maar and the adjoining La Breña caldera. The objections presented by Aranda-Gómez and coworkers (1990), termed conclusive and supportive, can be categorized as: (1) questioning the one-maar interpretation; (2) questioning details of the developmental model for the El Jagüey-La Breña complex; or as (3) supportive of their own two-maar interpretation. I welcome the opportunity to answer to their objections and elaborate on this distinctive type of maar volcano.
Para continuar, descargue el artículo completo
Esta obra está bajo una Licencia Creative Commons Atribución/Reconocimiento 4.0 Internacional.